The case, described in a report with the thrilling title "Dark Green Blood in the Operating Theatre," occurred at St. Paul's Hospital at the University of British Columbia in Vancouver, Canada. The patient was a 42-year-old man with a condition known as compartment syndrome (a compression of nerves and blood vessels) in his legs.
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Read more about it here: www.cbc.ca/canada/british-columbia/story/2007/06/08/health-green-blood.html.
— Rosie Mestel